Zero-padding or cyclic prefix for MDFT-based filter bank multicarrier communications

Authors:
Fernando Cruz-Roldán;Manuel Blanco-Velasco;Juan I. Godino Llorente
Affiliations:
Department of Teoría de la Señal y Comunicaciones, Escuela Politécnica Superior, Universidad de Alcalá, 28871 Alcalá de Henares, Spain;Department of Teoría de la Señal y Comunicaciones, Escuela Politécnica Superior, Universidad de Alcalá, 28871 Alcalá de Henares, Spain;Department of Ingeniería de Circuitos y Sistemas, E.U.I.T.de Telecomunicación, Universidad Politécnica de Madrid, 28031 Madrid, Spain
Venue:
Signal Processing
Year:
2012

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Abstract

In this paper, the problem of channel equalization in modified discrete Fourier transform (MDFT)-based filter-bank multicarrier system (FBMC) is addressed. Two different system models based on padding zeros or using cyclic prefix in each transmitted block are presented. The proposed systems utilize IFFT/FFT blocks embedded in an MDFT-FBMC system. In the first one, an equalization block similar to single-carrier systems is included as the first stage in the receiver. The second system basically consists of an OFDM embedded in the MDFT-based transmultiplexer (TMUX). For both systems, the channel equalization is performed at the receiver in the frequency-domain by using a one-tap per subcarrier equalizer. Finally, several simulation results obtained in different scenarios are presented to assess the performance of the proposed systems compared to the standardized DFT-based systems (OFDM).